Im sorry but i believe your brother has pretty bad case of the onedirectionitis. This can even spread into a bieber fever if not taken care of. Hell need to listen to AC/DC at least three times a day, have Led Zeppelin on in the background for two hours a day, and learn the lyrics to some Aerosmith songs and sing them repeatedly. That should take care of it before it spreads to you or anyone else in the house. After he is treated keep a close eye on him to see that it does not return.